2750-76-7 4-O-[2-(Diethylamino)-2-oxoethyl]rifamycin AIDS-009590 AIDS009590 M/14 N,N-Diethylrifamycin B amide NSC133099 Rf m-14 Rifamide Rifampicin M/14 Rifamycin B diethylamide Rifamycin B, N,N-diethylamide